Core molding machine



Feb. 23, 1932. D B, DMCK `1,846,998

CORE MOLDING MACH-INE original Filed oct. 25, 1929 2 sheets-sheet 1 D. B. DIMICK CORE MOLDING MACHINE' Feb. 23, 1932.

ZSheets-Sheet 2 Original Filed Oct..25, 1929 Snventor- Gttorne Patented Fel). 23, 1832 Y, reeaee T, Frio-E.

DANIEL BAKER nMroK, or'iBiRriINGnAr/r; iiLiri?,ArunV GORE MoLnINe' rninonrrii;

Original application filed. October 23, 1929;,.Seria1 No. 4013767. Divided and. this, application led December y e 23, 1930. Serial No. 504,391.

The present invention relates to improvements in core molding machines, and is a divisionI of my copending application 'en titled Method and apparatus for casting 5 pipe, Ser. No. 401,767, tiled October 23, 1929. It is an object of the present invention to provide an improved core molding machine, which a bellA core is formed for cast iron pipe, useful ini connection with the mold described in my application y aforesaid. f

' It is another object or the invention to providev anf improvedV machine for' moldingi a n bell co'rehavin'g axpour basin'and depressions for forming locking keyson thev bell of the ipe. ,Y p With the foregoing and other objects in view, the invention will be more Jfully described hereinafter and will be more partic- Y ularly pointed out in the claims appended 29 hereto. Y

In the drawings, wherein like symbols referV to' like or corresponding'parts throughout the Several views,

Figure 1 is a front elevatiom'with parts broken away and parts shown in section, of an improved core' molding machine' constructed in accordance with `the present invention. j

Figure 2 is a view similar to Figure l, but vwith the bell core pattern keys drawn back into the mold stripping position, and' the completed combined bellcore and; pour basin ,mechanically stripped or lifted' from the :core box sectionofthe machine, ready torb'e ,removed to its place in a flask mold. Y .4 Figure is a top plan view oi the improved lbell'corebox used, showing also the bell core keys., y

Figure4 is-a section taken onvthe line44 in Figure 3, with the bell core keys removed, .and t Figure 5 is also a sectional view taken on the line 5-5also in Figure 3. l

Referring: more particularly to theA Vdrawrfor bell locking keys.`

ings, the runner box is shown Vat 48. This runner box 48 may be a combination of' cast iron and steelt-of suchkpform as to sup-port' the tempered. molding sand49, when rammed to the shape-and size desi-redtomake' a com- 50 bined bell4 core and pour basin; At 50 are i shown the impressions made'in the'bell core bythe bell locking key patterns, leaving cavities ofthe size and inthe position desired The pour -basi'nis in? r dicatedat45a. y 4 'Now Vthe runner box 48 and its core are 'prepared'upon the machine shown in Figures l and 2; This.machineincludesfin its construction a' corebox 53, which 'core box is moreparticularly shown in 4Figures 3,4 and 5. The insideofthe core box is machinedvto the size andi shape ort-he bell Vcore desired. 'A 1i'a`nge54is providedV on the core box to center the runner boX 48; vThe coreboX slidably supports the tapered locking keypatterns 55 for-the bell core. These key patterns 55are `mounted for radial slidingjmovement inthe corebox and crank handles 56 are provided.

for shifting thev key patterns 55 backend 70 lforth, such handles 56 being provided withv threaded shafts 577 which engage thorugh threaded openings in portions 58 of the key patterns, the threaded shaftv being held againstlongitudinal motion by the yendcol lars'.`59,'but, of course, beingffree tobe ro- Vtated. The `bottom'or table 60 fortherunner box isadapted to 'receive and support the Y same and is carried bythe jspi'der 61.1',v v

The supporting legs 62 for the corebox Y `are erected fupon the bedplate 63 of the machine. This bed plate supports-.a hydraulic @or other cylinder 64 having the plunger 65 therein Y coupled tothe plunger rod .66VI to `rEhe )upper 85 which the spider 61 is aiiiXed.

-endoi the plunger rod 66lmoves in al guide sleeve 67. The guide sleeve 67 forms the :hub of the corebon. AThe cover 68 ofthe cylinder :64 limits the' upward travelof the soVVV l in Figures '3, 4 and 5.

lil

piston 65. A dust capV 69 maybe provided on the hub 67 of the core box.

The core box is machined to give the shape and size of the bell core desired wand has recesses 87 machined in its upper surfaceto receive the bell locking key patterns 55.

This core box is shown mor particularly tracted and thus moved toward or away from the center of the core box'. onradial lines. of the core box is machined `to lit the bore of the runner box 48. v

In the molding of the combined bell core and pour basin, the bellv key patterns 55, shown in F igurespl 'and 2, are moved lin by turning crank l56 until they project inside the core box 53to the thickness of the keys K desired, the core bottom plate beinglin `its lowest position, asshown in Figure l.

l The runnerk box 48 is centeredby the inner ring 54 of the core box and is supported on lits outer ring by the-top of the core box 53 and on its innerV ring bythe platform or corev bottom ringrO which -acts 4as a stripping plate. Tempered Vmolding sand 49 is rammed inthe runner box,jthe sand taking the 'shape of thev bell core,` desired.` Gates for either top or bottom pouring, as desired, are molded inthe runner box, and the pour basin inthe upper sand inthe runner; box is shaped to givethem-o-lten iron an unrestricted path of,V travel Varound to the/gates l f `'Iheco'mbined bell core and 'asinolded in the runner'box 48, is now placed I inthe completed liaskmold.`

evenly. After ramming the sand, the key patterns 55 are drawn back by means ofthe cranks 56 to the-position shown inv Figure 2, leaving impressions 50 in the bell core to make the bell locking keys. Compressed air isv admitted beneath the piston 65, raising the'piston, the rod 66, kthe core bottom or -stripping plate-.6,0 and they combination ,bell core and lpour basin, as shown in Figure 2.

This combination bell core and pour basin is nowready `to be placed on thecompleted flask mold, as described in my copending application aforesaid. Y Y n vAfter `removal of the completed bell core, the core bottom plate is lowered by gravity upon the release of the compress'edfair under the piston 65, thereby completing themolding cyclenof the Vcombined bell core andpour basin.` f'.

pouring basin,-

The completed pipe mold is now ready for` pouring.y

The outer surface of the inner ring After pouring, therunner box 48 is removed and returned to thebell core molding machine.

l' It will be obvious that various changes in the construction, combination and arrangement of parts could be made, which could be used without departing from the spirit of my invention, and I do not mean to limit the invention to such details, except as particularlyV pointed outJ in the claims.

Having thus describedmy invention, what I claim Yand desire to securebyLetters Patent of the United States is l. A bell core molding machine, comprising a bellcore box, locking-key patterns lmovablycarried by said box, a shifta-ble table moving through said bellv core box for carrying a runnery box, and vmeans formoving ksaid table.-v

2. A'bellcore molding machine, comprisving a-bell'core Vbox, a'table moving therethroughfor supporting a runner box, and a plurality lof radially shiftable locking key patterns carried by said bellL core 'box and forming impressions in the sand in saidrunn er box when in a lowered positiom v 3. Abell core moldingfmachinej, comprising a bell core box, a table shiftable vertically through saidbox for supporting airunner Y box, locking key patterns distributed horizontally kaboutjsaid bell cor'ebox andl moving radially with respect to thecenterof the box and acting to form,in ipressionsl in the.

sand in said .runner box, and means whereby said patterns may be shifted back and forth.

4. Abell core moldingmachine,comprising a bell core box, locking key patterns mov- 1 ably mounted in said box, a 'shift-able table moving through said box for supporting a runner box, and a power ram for actuating said table., Y j

k5. A bell coremolding machine comprising a bellcore box having asubstantially flat upper molding surfaceto receive-the moldling. material directly thereon, said surface having slots opening upwardly therethrough, key `patterns moving radially in said slots, a movable table for directly supportinga runner box in which the combined bellcore andpourV basin is rammed, said table moving through the bell core box-and means for mov- Iing said table. t 4 y, i

v 4 6. A bell core molding machine comprising "a core box having an upper' surface for receiving the rammed sand and having radial slots therein, key patterns slidable radially lin said slots and exposed on the upper surface'` of the box, a table normally' below the surface of said box for receiving a portion of the rammed 'sand and also-supporting a run- "ner box in which the sand is'rammed, and

means for moving said table to eject the runner box` after the' ramming operation;

7; A bell core molding machine comprising a core box having an upper annular surface fno i for directly receiving the rammed sand thereon and having radial slots in said surface, key patterns movably mounted in said radial slots, means for shifting said key patterns so as to extend inwardly of the annular surface, a table supported inwardly and normally below said surface for receiving directly thereon the rammed sand inwardly of the annulus and also for receiving a portion of a runner box in which the sand is rammed, and means for moving said table to eject the runner box and core after the molding operation.

DANIEL BAKER DIMICK. 

